We start at the city of Ushuaia and head for the National Park Tierra del Fuego. We start the excursion walking through a 6 Km long path which borders the Beagle Channel. From there, we head for Lake Roca, where after lunch, we get ready to go down the river rowing to Lapataia Bay, we disembark and start a slow walk, visiting beaver dams and sphagnum bogs and we get to Lake Verde, where after a snack, we start our way back to Ushuaia.